ポリマー背骨のシグマトロピク再配置:ポリエステルからビニールポリマーを1つのステップで
Rachael A J Ditzler1, Aleksandr V Zhukhovitskiy1
1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.
Journal of the American Chemical Society
|November 23, 2021
まとめ
ポリエステルをビニールポリマーに変形させ,新しい骨組み改造方法を用いた. このポリマーの変換は 熱的性質が変化した 高度な材料への新しい経路を提供します
科学分野:
- ポリマー化学
- 有機合成
- 材料科学
背景:
- ポリマー改変はプラスチックアップサイクリングと刺激反応性物質の開発に不可欠です.
- 現在の方法は主にポリマーの周辺部を標的とし,骨幹の改変を制限しています.
- ポリマーの骨格変化のための新しい戦略の開発は不可欠です.
研究 の 目的:
- ポリエステルバックボーンを改造するための割れのない方法を実証する.
- アイルランド・クライスンシグマトロピック再配列を用いてポリエステルをビニルポリマーに変換する.
- ラクトンから新しいビニルポリマーの合成を探求する.
主な方法:
- アイルランド-クライセンシグマトロピク再配列を用いて,ポリマー骨格変換を行う.
- 変更の定量的な性質と分裂のない性質を調査する.
- 変換後の熱特性 (ガラス化温度と熱安定性) の変化を分析する.
主要な成果:
- ポリエステルの背骨のほとんど量的な,割れのない改変を達成しました.
- ポリエステルからビニールポリマーに変換し 商品プラスチックに似た性質を持つ
- 変更されたポリマーのガラス化温度と熱安定性における重要な変化が観察された.
結論:
- ポリエステル骨組みの改造に有効な経路を提供している.
- この方法は,ラクトンからビニルポリマーを合成し,新しい材料へのアクセスを可能にします.
- この変換は,ポリマーの熱特性に大きな影響を及ぼし,調節可能な材料特性を提供します.
関連する概念動画
Types of Step-Growth Polymers: Polyesters
2.4K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.4K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
2.8K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.8K
[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement
2.3K
The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
2.3K
Polymer Classification: Stereospecificity
2.8K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.8K
Olefin Metathesis Polymerization: Overview
2.3K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.3K
Radical Chain-Growth Polymerization: Mechanism
2.9K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.9K


